Patent US4512031A successfully refreshed from Google Patents.
US4512031A
Expired / Lapsed
US
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Arrangement for receiving TV-signals having left and right stereo sound signals
Assignee: US Philips Corp
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Filing: 1982-08-17
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Granted: 1985-04-16
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Expires: 2002-08-17
Abstract
Abstract Arrangement for receiving TV signals containing left and right stereo sound signals, a first sound carrier being frequency-modulated by the sum signal (L+R) of the two stereo sound signals and the second carrier being frequency-modulated by twice the right stereo sound signal (2R), comprising a first FM-demodulator for demodulating the sum signal from the first sound carrier and a second FM-demodulator for demodulating twice the right stereo sound signal from the second sound carrier, a matrix circuit for deriving at least the left stereo sound signal from the sum signal and twice the right stereo sound signal and a left and right sound channel for the respective left and right stereo sound signals, the possibility of a simple mono-stereo signal control being obtained such as it is already known for prior art stereo radio receivers in addition to an advantageous noise distribution over the left and the right stereo sound channels. For this purpose the said matrix circuit consists of a first sub-matrix for deriving a difference signal (L-R and/or R-L) of the two stereo sound signals from the sum signal and twice the right stereo sound signal, and a second sub-matrix for deriving at least the left stereo sound signal from the sum signal and the difference signal.
Inventors
- 👤 Cornelis J. M. Van Gils
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:35
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/60; H04N5/607
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
198 words
An arrangement for receiving TV-signals containing left and right stereo sound signals, a first sound carrier being frequency-modulated by the sum signal (L+R) of the two stereo sound signals and a second sound carrier being frequency-modulated by twice the right stereo sound signal (2R), comprising a first FM-demodulator for demodulating the sum signal from the first carrier and a second FM-demodulator for demodulating twice the right stereo sound signal from the second sound carrier, a matrix circuit for deriving at least the left stereo sound signal from the sum signal and twice the right stereo sound signal, and a left and right sound channel for the respective left and right stereo sound signals, characterized in that the matrix circuit comprises a first submatrix for deriving the difference signal (L-R and/or R-L) of the two stereo sound signals from the sum signal and twice the right stereo sound signal, and a second submatrix for deriving at least the left stereo sound signal from the sum signal and the difference signal, and a difference signal adjusting circuit is coupled between the first and the second submatrices for symmetrically adjusting the crosstalk attenuation between the left and the right sound channel.
Claim 2
Dependent Claim
198 words
An arrangement for receiving TV-signals containing left and right stereo sound signals, a first sound carrier being frequency-modulated by the sum signal (L+R) of the two stereo sound signals and a second sound carrier being frequency-modulated by twice the right stereo sound signal (2R), comprising a first FM-demodulator for demodulating the sum signal from the first carrier and a second FM-demodulator for demodulating twice the right stereo sound signal from the second sound carrier, a matrix circuit for deriving at least the left stereo sound signal from the sum signal and twice the right stereo sound signal, and a left and right sound channel for the respective left and right stereo sound signals, characterized in that the matrix circuit comprises a first submatrix for deriving the difference signal (L-R and/or R-L) of the two stereo sound signals from the sum signal and twice the right stereo sound signal, and a second submatrix for deriving at least the left stereo sound signal from the sum signal and the difference signal, and a difference signal adjusting circuit is coupled between the first and the second submatrices for symmetrically adjusting the crosstalk attenuation between the left and the right sound channel.
Claim 3
Dependent Claim
45 words
An arrangement as claimed in claim 1, characterized by a sum signal adjusting circuit for controlling the supply of the sum signal to the second sub-matrix, the control of the sum signal adjusting circuit being inverse to the control of the difference signal adjusting circuit.
Claim 4
Dependent Claim
215 words
An arrangement for receiving TV-signals containing left and right stereo sound signals, a first sound carrier being frequency-modulated by the sum signal (L+R) of the two stereo sound signals and a second sound carrier being frequency-modulated by twice the right stereo sound signal (2R), comprising a first FM-demodulator for demodulating the sum signal from the first carrier and a second FM-demodulator for demodulating twice the right stereo sound signal from the second sound carrier, a matrix circuit for deriving at least the left stereo sound signal from the sum signal and twice the right stereo sound signal, and a left and right sound channel for the respective left and right stereo sound signals, characterized in that the matrix circuit comprises a first submatrix for deriving the difference signal (L-R and/or R-L) of the two stereo sound signals from the sum signal and twice the right stereo sound signal, and a second submatrix for deriving at least the left stereo sound signal from the sum signal and the difference signal, and said arrangement further comprises a further signal transmission path between the output of the second FM demodulator and the second submatrix for applying the sound signal demodulated by the second FM-demodulator to the two sound channels in the case two non-stereophonic sound signals are received.
Claim 5
Dependent Claim
215 words
An arrangement for receiving TV-signals containing left and right stereo sound signals, a first sound carrier being frequency-modulated by the sum signal (L+R) of the two stereo sound signals and a second sound carrier being frequency-modulated by twice the right stereo sound signal (2R), comprising a first FM-demodulator for demodulating the sum signal from the first carrier and a second FM-demodulator for demodulating twice the right stereo sound signal from the second sound carrier, a matrix circuit for deriving at least the left stereo sound signal from the sum signal and twice the right stereo sound signal, and a left and right sound channel for the respective left and right stereo sound signals, characterized in that the matrix circuit comprises a first submatrix for deriving the difference signal (L-R and/or R-L) of the two stereo sound signals from the sum signal and twice the right stereo sound signal, and a second submatrix for deriving at least the left stereo sound signal from the sum signal and the difference signal, and said arrangement further comprises a further signal transmission path between the output of the second FM demodulator and the second submatrix for applying the sound signal demodulated by the second FM-demodulator to the two sound channels in the case two non-stereophonic sound signals are received.
Claim 6
Dependent Claim
41 words
An arrangement as claimed in claim 1, characterized in that the difference signal adjusting circuit arranged between the first and second sub-matrices functions at the same time as a signal blocking arrangement in the case two non-stereophonic sound signals are received.
Claim 7
Dependent Claim
43 words
An arrangement as claimed in claim 2, characterized in that the sum signal adjusting circuit functions at the same time as a signal blocking arrangement on receipt of two non-stereophonic sound signals and reproduction of the signal demodulated by the second FM demodulator.
References Cited (Backward Citations)
DE2902933A1
Cited
US4389536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |